? 2004 fairchild semiconductor corporation ds500199 www.fairchildsemi.com june 1999 revised october 2004 74vcxh2245 low voltage bidirectional transceiver with bushold 74vcxh2245 low voltage bidirectional transceiver with bushold and 26 ? series resistors in b outputs general description the vcxh2245 contains eight non-inverting bidirectional buffers with 3-state outputs and is intended for bus ori- ented applications. the t/r input determines the direction of data flow. the oe input disables both the a and b ports by placing them in a high impedance state. the vcxh2245 data inputs include active bushold circuitry, eliminating the need for external pull-up resistors to hold unused or float- ing data inputs at a valid logic level. the 74vcxh2245 is designed for low voltage (1.4v to 3.6v) v cc applications. the vcxh2245 is also designed with 26 ? series resistance in the b port outputs. this design reduces line noise in applications such as memory address drivers, clock drivers, and bus transceivers trans- mitters the 74vcxh2245 is fabricated with an advanced cmos technology to achieve high-speed operation while main- taining low cmos power dissipation. features 1.4v-3.6v v cc supply operation 3.6v tolerant control inputs bushold on data inputs eliminates the need for external pull-up/pull-down resistors 26 ? series resistors in b port outputs t pd (a to b) 4.4 ns max for 3.0v to 3.6v v cc static drive (i oh /i ol b outputs): 12 ma @ 3.0v v cc uses patented quiet series ? noise/emi reduction circuitry latchup performance exceeds 300 ma esd performance: human body model > 2000v machine model > 200v ordering code: devices also available in tape and reel. specify by appending the suffix letter ?x? to the ordering code. logic symbol connection diagram quiet series ? is a trademark of fairchild semiconductor corporation. order number package number package description 74vcxh2245wm m20b 20-lead small outline integrated circuit (soic), jedec ms-013, 0.300" wide 74VCXH2245MTC mtc20 20-lead thin shrink small outline package (tssop), jedec mo-153, 4.4mm wide
www.fairchildsemi.com 2 74vcxh2245 pin descriptions truth table h = high voltage level l = low voltage level x = immaterial z = high impedance logic diagram pin names description oe output enable input (active low) t/r transmit/receive input a 0 ? a 7 side a bushold inputs or 3-state outputs b 0 ? b 7 side b bushold inputs or 3-state outputs inputs outputs oe t/r l l bus b 0 ? b 7 data to bus a 0 ? a 7 l h bus a 0 ? a 7 data to bus b 0 ? b 7 h x high z state on a 0 ? a 7 , b 0 ? b 7
3 www.fairchildsemi.com 74vcxh2245 absolute maximum ratings (note 1) recommended operating conditions (note 3) note 1: the absolute maximum ratings are those values beyond which the safety of the device cannot be guaranteed. the device should not be operated at these limits. the parametric values defined in the electrical characteristics tables are not guaranteed at the absolute maxi mum ratings. the ? recom- mended operating conditions ? table will define the conditions for actual device operation. note 2: i o absolute maximum rating must be observed. note 3: floating or unused control inputs must be held high or low. dc electrical characteristics supply voltage (v cc ) ? 0.5v to + 4.6v dc input voltage (v i ) t/r , oe ? 0.5v to 4.6 v i/o ports ? 0.5v to v cc + 0.5v dc output voltage (v o )(note 2) ? 0.5v to v cc + 0.5v dc input diode current (i ik ) v i < 0v ? 50 ma dc output diode current (i ok ) v o < 0v ? 50 ma v o > v cc + 50 ma dc output source/sink current 50 ma (i oh /i ol ) dc v cc or ground current 100 ma storage temperature (t stg ) ? 65 c to + 150 c power supply voltage (v cc ) operating 1.4v to 3.6v input voltage ? 0.3v to v cc output voltage (v o )0v to v cc output current in i oh /i ol - a outputs v cc = 3.0v to 3.6v 24 ma v cc = 2.3v to 2.7v 18 ma v cc = 1.65v to 2.3v 6 ma v cc = 1.4v to 1.65v 2 ma output current in i oh /i ol - b outputs v cc = 3.0v to 3.6v 12 ma v cc = 2.3v to 2.7v 8 ma v cc = 1.65v to 2.3v 3 ma v cc = 1.4v to 1.65v 1 ma free air operating temperature (t a ) ? 40 c to + 85 c minimum input edge rate ( ? t/ ? v) v in = 0.8v to 2.0v, v cc = 3.0v 10 ns/v symbol parameter conditions v cc min max units (v) v ih high level input voltage 2.7 - 3.6 2.0 v 2.3 - 2.7 1.6 1.65 - 2.3 0.65 x v cc 1.4 - 1.6 0.65 x v cc v il low level input voltage 2.7 - 3.6 0.8 v 2.3 - 2.7 0.7 1.65 - 2.3 0.35 x v cc 1.4 - 1.6 0.35 x v cc v oh high level output voltage i oh = ? 100 a 2.7 - 3.6 v cc - 0.2 v a outputs i oh = ? 12 ma 2.7 2.2 i oh = ? 18 ma 3.0 2.4 i oh = ? 24 ma 3.0 2.2 i oh = ? 100 a 2.3 - 2.7 v cc - 0.2 i oh = ? 6 ma 2.3 2.0 i oh = ? 12 ma 2.3 1.8 i oh = ? 18 ma 2.3 1.7 i oh = ? 100 a 1.65 - 2.3 v cc - 0.2 i oh = ? 6 ma 1.65 1.25 i oh = ? 100 a 1.4 - 1.6 v cc - 0.2 i oh = ? 2 ma 1.4 1.05
www.fairchildsemi.com 4 74vcxh2245 dc electrical characteristics (continued) note 4: an external driver must source at least the specified current to switch from low-to-high. note 5: an external driver must sink at least the specified current to switch from high-to-low. symbol parameter conditions v cc min max units (v) v oh high level output voltage i oh = ? 100 a 2.7 - 3.6 v cc - 0.2 v b outputs i oh = ? 6 ma 2.7 2.2 i oh = ? 8 ma 3.0 2.4 i oh = ? 12 ma 3.0 2.2 i oh = ? 100 a 2.3 - 2.7 v cc - 0.2 i oh = ? 4 ma 2.3 2.0 i oh = ? 6 ma 2.3 1.8 i oh = ? 8 ma 2.3 1.7 i oh = ? 100 a 1.65 - 2.3 v cc - 0.2 i oh = ? 3 ma 1.65 1.25 i oh = ? 100 a 1.4 - 1.6 v cc - 0.2 i oh = ? 1 ma 1.4 1.05 v ol low level output voltage i ol = 100 a 2.7 - 3.6 0.2 v a outputs i ol = 12 ma 2.7 0.4 i ol = 18 ma 3.0 0.4 i ol = 24 ma 3.0 0.55 i ol = 100 a 2.3 - 2.7 0.2 i ol = 12 ma 2.3 0.4 i ol = 18 ma 2.3 0.6 i ol = 100 a 1.65 - 2.3 0.2 i ol = 6 ma 1.65 0.3 i ol = 100 a 1.4 - 1.6 0.2 i ol = 2 ma 1.4 0.35 v ol low level output voltage i ol = 100 a 2.7 - 3.6 0.2 v b outputs i ol = 6 ma 2.7 0.4 i ol = 8 ma 3.0 0.55 i ol = 12 ma 3.0 0.8 i ol = 100 a 2.3 - 2.7 0.2 i ol = 6 ma 2.3 0.4 i ol = 8 ma 2.3 0.6 i ol = 100 a 1.65 - 2.3 0.2 i ol = 3 ma 1.65 0.3 i ol = 100 a 1.4 - 1.6 0.2 i ol = 1 ma 1.4 0.35 i i input leakage current v in = v cc or gnd 1.4 - 3.6 5.0 a i i(hold) bushold input minimum v in = 0.8v 3.0 75.0 a drive hold current v in = 2.0v 3.0 ? 75.0 v in = 0.7v 2.3 45.0 v in = 1.6v 2.3 ? 45.0 v in = 0.57v 1.65 25.0 v in = 1.07v 1.65 ? 25.0 i i(od) bushold input over-drive (note 4) 3.6 450 a current to change state (note 5) 3.6 ? 450 (note 4) 2.7 300 (note 5) 2.7 ? 300 (note 4) 1.95 200 (note 5) 1.95 ? 200 i oz 3-state output leakage v o = v cc or gnd 1.4 - 3.6 10.0 a v i = v ih or v il i cc quiescent supply current v i = v cc or gnd 1.4 - 3.6 20.0 a ? i cc increase in i cc per input v ih = v cc ? 0.6v 2.7 - 3.6 750 a
5 www.fairchildsemi.com 74vcxh2245 ac electrical characteristics (note 6) note 6: for c l = 50 pf, add approximately 300 ps to the ac maximum specification. note 7: skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of th e same device. the specification applies to any outputs switching in the same direction, either high-to-low (t oshl ) or low-to-high (t oslh ). symbol parameter conditions v cc t a = 40 c to + 85 c units figure (v) min max number t phl propagation delay c l = 30 pf, r l = 500 ? 3.3 0.3 0.6 3.5 ns figures 1, 2 t plh b n to a n 2.5 0.2 0.8 4.2 1.8 0.15 1.5 8.4 c l = 15 pf, r l = 2k ? 1.5 0.1 1.0 16.8 figures 5, 6 t pzl output enable time c l = 30 pf, r l = 500 ? 3.3 0.3 0.6 4.5 ns figures 1, 3, 4 t pzh b n to a n 2.5 0.2 0.8 5.6 1.8 0.15 1.5 9.8 c l = 15 pf, r l = 2k ? 1.5 0.1 1.0 19.6 figures 5, 7, 8 t plz output disable time c l = 30 pf, r l = 500 ? 3.3 0.3 0.6 3.6 ns figures 1, 3, 4 t phz b n to a n 2.5 0.2 0.8 4.0 1.8 0.15 1.5 7.2 c l = 15 pf, r l = 2k ? 1.5 0.1 1.0 14.4 figures 5, 7, 8 t phl propagation delay c l = 30 pf, r l = 500 ? 3.3 0.3 0.6 4.4 ns figures 1, 2 t plh a n to b n 2.5 0.2 0.8 5.6 1.8 0.15 1.5 9.8 c l = 15 pf, r l = 2k ? 1.5 0.1 1.0 19.6 figures 5, 6 t pzl output enable time c l = 30 pf, r l = 500 ? 3.3 0.3 0.6 5.0 ns figures 1, 3, 4 t pzh a n to b n 2.5 0.2 0.8 6.6 1.8 0.15 1.5 9.8 c l = 15 pf, r l = 2k ? 1.5 0.1 1.0 19.6 figures 5, 7, 8 t plz output disable time c l = 30 pf, r l = 500 ? 3.3 0.3 0.6 4.2 ns figures 1, 3, 4 t phz a n to b n 2.5 0.2 0.8 4.7 1.8 0.15 1.5 8.5 c l = 15 pf, r l = 2k ? 1.5 0.1 1.0 16.9 figures 5, 7, 8 t oshl output to output skew c l = 30 pf, r l = 500 ? 3.3 0.3 0.5 ns t oslh (note 7) 2.5 0.2 0.5 1.8 0.15 0.75 c l = 15 pf, r l = 2k ? 1.5 0.1 1.5
www.fairchildsemi.com 6 74vcxh2245 dynamic switching characteristics capacitance symbol parameter conditions v cc t a = 25 c units (v) typical v olp quiet output dynamic peak v ol ,c l = 30 pf, v ih = v cc , v il = 0v 1.8 0.3 v b to a 2.5 0.7 3.3 1.0 quiet output dynamic peak v ol , c l = 30 pf, v ih = v cc , v il = 0v 1.8 0.2 v a to b 2.5 0.45 3.3 0.65 v olv quiet output dynamic valley v ol , c l = 30 pf, v ih = v cc , v il = 0v 1.8 ? 0.3 v b to a 2.5 ? 0.7 3.3 ? 1.0 quiet output dynamic valley, v ol ,c l = 30 pf, v ih = v cc , v il = 0v 1.8 ? 0.2 v a to b 2.5 ? 0.45 3.3 ? 0.65 v ohv quiet output dynamic valley v oh ,c l = 30 pf, v ih = v cc , v il = 0v 1.8 1.3 v b to a 2.5 1.7 3.3 2.0 quiet output dynamic valley v oh ,c l = 30 pf, v ih = v cc , v il = 0v 1.8 1.5 v a to b 2.5 2.0 3.3 2.5 symbol parameter conditions t a = + 25 c units typical c in input capacitance v i = 0v or v cc , v cc = 1.8v, 2.5v or 3.3v 6 pf c i/o input/output capacitance v i = 0v or v cc , v cc = 1.8v, 2.5v or 3.3v 7 pf c pd power dissipation capacitance v i = 0v or v cc , f = 10 mhz, v cc = 1.8v, 2.5v or 3.3v 20 pf
7 www.fairchildsemi.com 74vcxh2245 ac loading and waveforms (v cc 3.3v 0.3v to 1.8v 0.5v) figure 1. ac test circuit figure 2. waveform for inverting and non-inverting functions figure 3. 3-state output high enable and disable times for low voltage logic figure 4. 3-state output low enable and disable times for low voltage logic test switch t plh , t phl open t pzl , t plz 6v at v cc = 3.3 0.3v; v cc x 2 at v cc = 2.5v 0.2v; 1.8v 0.15v t pzh , t phz gnd symbol v cc 3.3v 0.3v 2.5v 0.2v 1.8v 0.15v v mi 1.5v v cc /2 v cc /2 v mo 1.5v v cc /2 v cc /2 v x v ol + 0.3v v ol + 0.15v v ol + 0.15v v y v oh ? 0.3v v oh ? 0.15v v oh ? 0.15v
www.fairchildsemi.com 8 74vcxh2245 ac loading and waveforms (v cc 1.5v 0.1v) figure 5. ac test circuit figure 6. waveform for inverting and non-inverting functions figure 7. 3-state output high enable and disable times for low voltage logic figure 8. 3-state output low enable and disable times for low voltage logic test switch t plh , t phl open t pzl , t plz v cc x 2 at v cc = 1.5v 0.1v t pzh , t phz gnd symbol v cc 1.5v 0.1v v mi v cc /2 v mo v cc /2 v x v ol + 0.1v v y v oh ? 0.1v
9 www.fairchildsemi.com 74vcxh2245 physical dimensions inches (millimeters) unless otherwise noted 20-lead small outline integrated circuit (soic), jedec ms-013, 0.300" wide package number m20b
www.fairchildsemi.com 10 74vcxh2245 low voltage bidirectional transceiver with bushold physical dimensions inches (millimeters) unless otherwise noted (continued) 20-lead thin shrink small outline package (tssop), jedec mo-153, 4.4mm wide package number mtc20 fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and fairchild reserves the right at any time without notice to change said circuitry and specifications. life support policy fairchild ? s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be rea- sonably expected to result in a significant injury to the user. 2. a critical component in any component of a life support device or system whose failure to perform can be rea- sonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com
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